如何在OS X上使用Swift获取目录大小

Question

我试图获取目录的大小,以及它使用Swift在OS X上的内容.到目前为止,我只能获得目录本身的大小,而不是它的内容.对于我的大多数目录,它通常显示6,148字节的值,但它确实有变化.

我从下面的文件中尝试过directorySize()函数,但它也返回了6,148个字节.

https://github.com/amosavian/ExtDownloader/blob/2f7dba2ec1edd07282725ff47080e5e7af7dabea/Utility.swift

我尝试了这个问题的前两个答案,但不确定它需要什么参数将Swift传递给Objective-C函数.我相信它想要一个指针(我是学习的初级程序员).

计算文件夹的大小

而且我无法从这里得到Swift的答案也可以用于我的目的.

如何获得给定路径的文件大小？

我正在使用Xcode 7.0并运行OS X 10.10.5.

Answer 1

更新:Xcode 8.2.1•Swift 3.0.2

// get your directory url
let documentsDirectoryURL =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
// check if the url is a directory
if (try? documentsDirectoryURL.resourceValues(forKeys: [.isDirectoryKey]))?.isDirectory == true {
    print("url is a folder url")
    // lets get the folder files
    var folderSize = 0
    (try? FileManager.default.contentsOfDirectory(at: documentsDirectoryURL, includingPropertiesForKeys: nil))?.lazy.forEach {
        folderSize += (try? $0.resourceValues(forKeys: [.totalFileAllocatedSizeKey]))?.totalFileAllocatedSize ?? 0
    }
    // format it using NSByteCountFormatter to display it properly
    let  byteCountFormatter =  ByteCountFormatter()
    byteCountFormatter.allowedUnits = .useBytes
    byteCountFormatter.countStyle = .file
    let folderSizeToDisplay = byteCountFormatter.string(for: folderSize) ?? ""
    print(folderSizeToDisplay)  // "X,XXX,XXX bytes"
}

如果要包含所有子文件夹,隐藏文件和包后代,则需要使用enumeratorAtURL,如下所示:

// get your directory url
let documentsDirectoryURL =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
// check if the url is a directory
if (try? documentsDirectoryURL.resourceValues(forKeys: [.isDirectoryKey]))?.isDirectory == true {
    var folderSize = 0
    (FileManager.default.enumerator(at: documentsDirectoryURL, includingPropertiesForKeys: nil)?.allObjects as? [URL])?.lazy.forEach {
        folderSize += (try? $0.resourceValues(forKeys: [.totalFileAllocatedSizeKey]))?.totalFileAllocatedSize ?? 0
    }
    let  byteCountFormatter =  ByteCountFormatter()
    byteCountFormatter.allowedUnits = .useBytes
    byteCountFormatter.countStyle = .file
    let sizeToDisplay = byteCountFormatter.string(for: folderSize) ?? ""
    print(sizeToDisplay)  // "X,XXX,XXX bytes"
}

Answer 2

对于正在寻找 Swift 5+ 和 Xcode 11+ 解决方案的任何人，请查看此要点

func directorySize(url: URL) -> Int64 {
    let contents: [URL]
    do {
        contents = try FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: [.fileSizeKey, .isDirectoryKey])
    } catch {
        return 0
    }

    var size: Int64 = 0

    for url in contents {
        let isDirectoryResourceValue: URLResourceValues
        do {
            isDirectoryResourceValue = try url.resourceValues(forKeys: [.isDirectoryKey])
        } catch {
            continue
        }
    
        if isDirectoryResourceValue.isDirectory == true {
            size += directorySize(url: url)
        } else {
            let fileSizeResourceValue: URLResourceValues
            do {
                fileSizeResourceValue = try url.resourceValues(forKeys: [.fileSizeKey])
            } catch {
                continue
            }
        
            size += Int64(fileSizeResourceValue.fileSize ?? 0)
        }
    }
    return size
}